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Sportster Motorcycle Tires, Wheels, and Brakes Discuss issues with Sportster motorcycle tires, wheels and brakes.

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  #1  
Old 14th September 2018
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Default 21"Avon Cobra/Tube Tire Pressure?

I have a 21" spoke front wheel with an Avon Cobra MH90-21 tire and tube. What is the proper air pressure. Thank you
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Old 14th September 2018
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Maximum pressure is on the side wall of the tire. You can also look at the Avon Tyre website.
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Quote:
Originally Posted by BlackBikeDave View Post
I have a 21" spoke front wheel with an Avon Cobra MH90-21 tire and tube. What is the proper air pressure. Thank you
30 psi
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After I posted this I was told 40psi. I was at 42psi per the sidewall but because I am using a tube with a spoke wheel I wasn't sure if it was any different than non tube. This is my first tube tire.
I just got back from a nice 50 mile round trip with some hiway and back road twisties. Feels and handles good at 40psi. Any other input is welcome.
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The pressure on the sidewall is the max working pressure rating... I go with ~30 psi per spec with my 21" Cobra and it works... tire warms up nicely, is compliant, sticky and tracks well in the wet and dry with good feedback over road irregularities..
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Diogenes415--- are you running spoke wheel with a tube and how did you come up with 10 psi under what the Avon rep said? Meaning how did you come up with the number 30psi?
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I have 21" spoked wheels with tubes on both of my XLs and I used the pressure stated in the HD manual as a starting point which also happened to be the best after trying a few psi higher and lower. The reason you don't go according to what's stamped on the tire sidewall is because the manufacturer has no idea what bike the tire will be fitted to so the ideal pressures cannot be determined, that's why max safe working pressure the tire is designed to withstand is printed instead. I also ran the very same 21" Cobra on my 390lbs 400cc dual sport and the pressure stated on the sidewall would have been ridiculous to run in that instance as well.
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When the factory recommends a certain tire pressure they take in to consideration safety, traction, weight, and handling and post the recommended tire pressure. If you put a stiffer set of springs in the forks and say add more weight you would want a higher air pressure. Lighten up the front end and you would want a lower pressure. It's not just the tire to be concerned about but also all the nuts and bolts holding the rest of it together. Different riding habits also would dictate how much air you want to run. The factory owners manuals say 30 psi and when I ride two up for a long distance I usually add 2-4 more pounds (this is the front tire ).
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Old 15th September 2018
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I use 36 with my 90/90 21 Metzler
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Great info! Thank you. My 19" mag front wheel was leaking from the bead all the way around on both sides and it went flat during a ride almost killing me and the bike.
Tube from now on for me. Just wanted to get it right.
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